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From:	"Arash Partow" <arashp AT hotmail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	problem comport, iocl and FIONREAD
Date:	Wed, 31 Dec 2003 00:16:54 +0000
Mime-Version:	1.0
Message-ID:	<BAY9-F13Qv8rcyNe3Eb00008b23@hotmail.com>
X-OriginalArrivalTime:	31 Dec 2003 00:16:54.0277 (UTC) FILETIME=[6516A350:01C3CF33]
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Hi all,

I'm seeing a problem with ioctl and FIONREAD, I use the
following code to check if there are any bytes in the
input buffer of a comport.
ie:

unsigned int SerialIO::getBufferSize()
{

    int bufferedBytes = 0;

    ioctl(IOPortHandle, FIONREAD, &bufferedBytes);

    if (bufferedBytes == -1)
    {

       bufferedBytes = 0;
       /* log an error */

    }

    return (unsigned int)bufferedBytes;

};


the problem is that even when there is data in the buffer
bufferedBytes has a value of zero.

Searching the net I've found an unresolved gcc bug report
on the same problem issued 2 months ago:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12722


I'm wondering
1. If any cygwin users have encountered such a problem?
2. If they have, were they able to find a solution etc..


Any help would be very much appreciated


Regards


Arash


PS: I ran the same code on solaris and openbsd, seems
to work fine...

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